Hire 100,000 IT coders, and simply require them to write 50 lines each. Of course, another 200,000 bureaucrats will be required to oversee them.
System integration? Irrelevant.
Time to success - infinity, but 300,000 jobs will be created, and the jobless numbers will look great (for a while).
And since it will be viewed as a government "jobs" program, every criteria except competence at coding or project management expertise will be used to hire candidates to fix it.
There will be a lot of people working who really, REALLY need a job, and their sex/race/ethnicity/social status/income level will count 90% towards hiring.
Just watch.